[1107] THE STUDY ON THE CARBONATION PROMOTION PROCESS OF HARDENED CEMENT PASTE IN THE DRIPPING METHOD
キーワード：CO2 absorption、hardened cement paste powder、carbonation、particle size、dripping method
Various particle sizes of hardened cement paste powder (HCPW) were carbonated by dripping method to compare with HCPW under a constant relative humidity of 60% or 85%. And measure and analyze the impact of different drip intervals on the carbonation process by TGA, FTIR and SEM-EDS. The results indicate that after 1 day of carbonation, the rate of calcium hydroxide in HCPW with 0.3-0.6mm was less than 5% in the dripping samples, around 13% at RH60, and around 8% at RH85. After 28 days, the CO2 absorption of 0.15-0.3mm increased by 71%, 33% compared to RH60, RH85, respectively. Keywords: CO2 absorption, hardened cement paste powder, carbonation, particle size, dripping method